目的　探讨髂嵴连线和肋架下缘连线作为定位椎体或椎间隙的可行性。  方法　216例正常成人，其中男98 例，女118 例，年龄  18～94  岁。均行胸腰骶椎立位X片和MR SE序列矢状位片，测定脊髓圆锥、髂嵴连线和肋架下缘对应的脊椎位置，并利用Reimanm方法进行量化，所得结果经统计学处理。  结果　脊髓圆锥、髂嵴连线和肋架下缘连线对应的脊椎位置分别为L1下三分之一（29.72±2.032）、L4~5（16.11±1.192）和L2~3（24.69±1.909），且后两者男女之间差别有统计学意义，肋架下缘对应的脊椎位置与年龄之间存在相关性。  结论　立位时，髂嵴连线对应的脊椎位置绝大部分为L4~5或L4，肋架下缘对应脊椎位置集中分布于L2~3，两者均能用于定位椎间隙的序数；两者结合定位可更好的减少操作风险。

Objective　To estimate the level of lumbar spine and the location of conus medullaris, taking the Tuffier's line and the lowest points of the ribcage as the new markers.　Methods　Simple X-ray and MR (T1-weighted, midline, sagittal, spinecho) of 216 healthy adults (male 98, and female 118), aged from 18 to 94, were performed to assess the position of conus medullaris, according to the guide of the Tuffier's line and the lowest points of the ribcage. This location point was recorded in relation to the upper, middle, or lower third of the adjacent vertebral body or interspace. The data were collected and statistically analyzed.　Results　Corresponding to the spine, the conus medullaris, Tuffier's line and the lowest points of the ribcage were at the lower 1/3 of L1 about 29.72±2.032, at L4~5 about 16.11±1.192, and at L2~3 about 24.69±1.909, respectively, furthermore, the above parameters were significantly sexual different. The spinal position located by the lowest ribcage was correlated with the age.　Conclusions　At the erection position, the tuffier's line corresponds to the level of L4~5 or L4, and the lowest ribcage corresponds to the lower third level of L2~3. Those two lines can be taken as the location markers to confirm the level of intervertebral space.